Girls, a question. We introduced complementary feeding earlier based o…

Girls, a question. We introduced complementary feeding earlier based on serious indications. I read that someone at 6 months gives cucumber, can it be done? According to all literature I love studying ? it's said not before 8. And also, for example, introducing peaches, there is no in jars, but there is in fruit salad, how to introduce it? Or just give the salad as everything else in it has been introduced?